Update README.md

ronnyroeller · web-flow · commit 237e2047a533 · 2019-12-10T12:44:30.000+01:00
diff --git a/README.md b/README.md
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 # migrate-cognito-user-pool-lambda
 
+See this [blog post](https://medium.com/collaborne-engineering/migrate-aws-cognito-user-pools-ff2a91a745a2?sk=f91b73b84396db6f41a294f54bfeb2db) for a description
+
 ## Usage
 
 Follow these steps to use the migration Lambda function:
